【题目】To my excitement, I met my favourit singer Jay Chou ________ while I was travelling in Singapore.
A. on purposeB.by chanceC. as usual D.in turn
在线课程【答案】B
【解析】
试题分析：考查词组。A. on purpose故意；B.by chance碰巧；C.as usual像平常一样； D.in turn反而。句意：令我兴奋的是，当我在新加坡旅游的时候我碰巧遇到了我最喜欢的歌星周杰伦。B项符合语境。